Jeff Kelley introduces the Grand Central Dispatch framework for writing concurrent applications for iOS.
Owen Barnes introduces SocketStream, a Node.js framework for building single-page real-time web applications that access all of their data via WebSocket.
Pete LePage lists a number of mobile development tools, frameworks and libraries, and introduces a testing and iteration process meant to ensure an application works on as many devices as possible.
Dio Synodinos explains and demoes HTML5 visualization tools and frameworks: CSS3, SVG, Canvas, WebGL, Raphaël, Processing.js, D3.js, Fabric.js, etc.
Nick Small introduces Batman.js, explaining what it is good for and why one should use it.